p-Hydrazinobenzenesulfonic acid is explored as a novel ultraviolet labeling reagent for capillary electrophoresis (CE) of mono- and disaccharides. The labeling reaction takes less than 10 minutes and introduces both o...p-Hydrazinobenzenesulfonic acid is explored as a novel ultraviolet labeling reagent for capillary electrophoresis (CE) of mono- and disaccharides. The labeling reaction takes less than 10 minutes and introduces both of absorption and charge groups into the sugars.展开更多
The hot top EMC (electromagnetic casting) method was put forward, namely, the shape of top liquid column was formed by the hot top in the screen and the semi suspended liquid column was formed by the electromagnetic f...The hot top EMC (electromagnetic casting) method was put forward, namely, the shape of top liquid column was formed by the hot top in the screen and the semi suspended liquid column was formed by the electromagnetic force nearby the liquid solid interface frontier. Using the numerical simulating technique, the temperature distribution was discussed, the effect of parameters such as upper conduct distance (UCD), cooling water rate of flow, pouring temperature and liquid column height on casting velocity were studied, the relationship among them was confirmed finally. According to the calculated results, the hot top EMC shaping system was designed and a lot of experiments were performed. The pure Al thin slabs of 480 mm×20 mm×850 mm were made successfully. The result showed that the casting velocity curve obtained experimentally almost coincides to the calculated one.展开更多
In order to obtain cast metal of high quality, an investigation was carried out by simultaneous imposition of multi electromagnetic fields from the outside of a cold crucible copper mold. Sn 4.5%Pb as a simulator of h...In order to obtain cast metal of high quality, an investigation was carried out by simultaneous imposition of multi electromagnetic fields from the outside of a cold crucible copper mold. Sn 4.5%Pb as a simulator of high melting point metal was continuously cast under different conditions. The results show that multi electromagnetic fields can eliminate surface defects, and coarse columnar grains of the solidification structure is turned into equiaxed crystal with the increase of magnetic flux density. Moreover, finer equiaxed crystal structure is obtained when rapidly solidified sheet is fed into the mold during continuous casting.[展开更多
Supercapacitors are favored by researchers because of their high power density,especially with the acceleration of people’s life rhythm.However,their energy density,especially from the point of view of the whole ener...Supercapacitors are favored by researchers because of their high power density,especially with the acceleration of people’s life rhythm.However,their energy density,especially from the point of view of the whole energy storage device,is far lower than that of commercial batteries.In this work,a kind of customizable full paper-based supercapacitor device with excellent self-healing ability is fabricated by simple and low-cost screen printing,electropolymerization and dip coating methods.The resultant separatorfree supercapacitor device exhibits both ultrahigh gravimetric and areal specific energy(power)densities of 39 Wh kg^(-1)(69 k W kg^(-1))and 692μWh cm^(-2)(236 m W cm^(-2)),achieving excellent supercapacitor performance.Notably,the addition of vitrimers endows the whole device with outstanding self-healing properties,which is helpful for enhancing the adaptability of the device to the environment.In addition,this kind of paper-based device also displays good photothermal and electromagnetic shielding performances.These striking features make paper matrix composites attractive in the fields of supercapacitors,medical photothermal treatment and electromagnetic shielding.展开更多
New electron donors with hydroxyl groups were synthesized and characterized spectroscopically. Their redox potentials were determined with cyclic voltammetry, and the comparison with BEDT-TTF [Bis(ethylenedithio)tetra...New electron donors with hydroxyl groups were synthesized and characterized spectroscopically. Their redox potentials were determined with cyclic voltammetry, and the comparison with BEDT-TTF [Bis(ethylenedithio)tetrathiafulvalene] in this aspect was made. These results indicated that the new electron donors had similar electron-donating capabilities as BEDT-TTF.展开更多
The electrochemical properties of MEH-PPV were: studied in ionic liquid([bmim](+)[PF6](-)) by cyclic voltammetry, chronoamperometry and AC impedance measurements. Both p- and n-doping of MEH-PPV were observed in the c...The electrochemical properties of MEH-PPV were: studied in ionic liquid([bmim](+)[PF6](-)) by cyclic voltammetry, chronoamperometry and AC impedance measurements. Both p- and n-doping of MEH-PPV were observed in the cyclic voltammograms, The chronoamperometric and AC impedance results indicate that the p-doping of MEH-PPV was controlled by the linear diffusion of counterions.展开更多
I.r.bands at 1559.0, 1441 .0, 1378 .9, 13603, 1031. 1,981 .4 and 947.3 cm -1 due tovarious types of dissociative adsorption of H2 over ZrO2 with changing temperatore wereobserved by in situ FT-IR spectroscopy.
The effects of 2.8% Cd on the electrochromic properties of NiOxHy film were studied. The film was electrodeposited on both the polished Ni plate and conductive ITO glass to study its electrochemical and optical charac...The effects of 2.8% Cd on the electrochromic properties of NiOxHy film were studied. The film was electrodeposited on both the polished Ni plate and conductive ITO glass to study its electrochemical and optical characteristics respectively. It was found that Cd could decrease the working voltage and increase the oxygen evolution voltage as well as the transmittance difference of colored and breached states of the film. However, it has little effect on the kinetic process.展开更多
It is reported that two kinds of specific mass spectrometric fragmentations are generated from dissociations of the intermediates of both the ion-neutral complex and the proton-bound complex. Collision-induced dissoci...It is reported that two kinds of specific mass spectrometric fragmentations are generated from dissociations of the intermediates of both the ion-neutral complex and the proton-bound complex. Collision-induced dissociation, isotopic labelling, and semi-empirical AM1 calculations were used to investigate the formation mechanism of the ion of m/z 139 from ionized tetrahydroimidazole-substituted methylene beta-diketones and the unimolecular fragmentations pathway of 3-phenyl-1-butyn-3-ol upon electron impact.展开更多
In this paper, the interaction between two collinear cracks inpiezoelectric materials under anti-plane shear loading wasinvestigated for the impermeable crack face conditions. By using theFourier transform, the proble...In this paper, the interaction between two collinear cracks inpiezoelectric materials under anti-plane shear loading wasinvestigated for the impermeable crack face conditions. By using theFourier transform, the problem can be solved with two pairs of tripleintegral equations. These equations are solved using Schmidt'smethod. This process is quite different from that adopted previously.This makes it possible to understand the two collinear cracksinteraction in piezoelectric materials.展开更多
基金NSFA !(No.29825112)CAS !(No.KJ951-A1-507)Madam Xu Guiyun (Center for Molecular Science, Institute of Chemistry, Chinese
文摘p-Hydrazinobenzenesulfonic acid is explored as a novel ultraviolet labeling reagent for capillary electrophoresis (CE) of mono- and disaccharides. The labeling reaction takes less than 10 minutes and introduces both of absorption and charge groups into the sugars.
文摘The hot top EMC (electromagnetic casting) method was put forward, namely, the shape of top liquid column was formed by the hot top in the screen and the semi suspended liquid column was formed by the electromagnetic force nearby the liquid solid interface frontier. Using the numerical simulating technique, the temperature distribution was discussed, the effect of parameters such as upper conduct distance (UCD), cooling water rate of flow, pouring temperature and liquid column height on casting velocity were studied, the relationship among them was confirmed finally. According to the calculated results, the hot top EMC shaping system was designed and a lot of experiments were performed. The pure Al thin slabs of 480 mm×20 mm×850 mm were made successfully. The result showed that the casting velocity curve obtained experimentally almost coincides to the calculated one.
文摘In order to obtain cast metal of high quality, an investigation was carried out by simultaneous imposition of multi electromagnetic fields from the outside of a cold crucible copper mold. Sn 4.5%Pb as a simulator of high melting point metal was continuously cast under different conditions. The results show that multi electromagnetic fields can eliminate surface defects, and coarse columnar grains of the solidification structure is turned into equiaxed crystal with the increase of magnetic flux density. Moreover, finer equiaxed crystal structure is obtained when rapidly solidified sheet is fed into the mold during continuous casting.[
基金financially supported by the National Natural Science Foundation of China(No.22078184)the China Postdoctoral Science Foundation(No.2019M653853XB)+6 种基金the Natural Science Foundation of Shaanxi Province(No.2020JQ-729)the Key Projects of Collaborative Innovation Center of Shaanxi Provincial Department of Educationthe Opening Project of Guangxi Key Laboratory of Clean Pulp&Papermaking and Pollution Control(No.2019KF21)the Natural Science Advance Research Foundation of Shaanxi University of Science and Technology(No.2018QNBJ-03)the National Demonstration Center for Experimental Light Chemistry Engineering Education(No.2018QGSJ02-13)the Jiangxi Qingyue Technology Co.,Ltd(No.210200122)the Biomass Chemistry and Materials Academician Workstation Project in SUST(No.134090002)。
文摘Supercapacitors are favored by researchers because of their high power density,especially with the acceleration of people’s life rhythm.However,their energy density,especially from the point of view of the whole energy storage device,is far lower than that of commercial batteries.In this work,a kind of customizable full paper-based supercapacitor device with excellent self-healing ability is fabricated by simple and low-cost screen printing,electropolymerization and dip coating methods.The resultant separatorfree supercapacitor device exhibits both ultrahigh gravimetric and areal specific energy(power)densities of 39 Wh kg^(-1)(69 k W kg^(-1))and 692μWh cm^(-2)(236 m W cm^(-2)),achieving excellent supercapacitor performance.Notably,the addition of vitrimers endows the whole device with outstanding self-healing properties,which is helpful for enhancing the adaptability of the device to the environment.In addition,this kind of paper-based device also displays good photothermal and electromagnetic shielding performances.These striking features make paper matrix composites attractive in the fields of supercapacitors,medical photothermal treatment and electromagnetic shielding.
基金the Chinese Academy of Sciences(KJ951-A1-501-03)
文摘New electron donors with hydroxyl groups were synthesized and characterized spectroscopically. Their redox potentials were determined with cyclic voltammetry, and the comparison with BEDT-TTF [Bis(ethylenedithio)tetrathiafulvalene] in this aspect was made. These results indicated that the new electron donors had similar electron-donating capabilities as BEDT-TTF.
基金the NSFC(29992530-4, 69986001) and the key projects of CAS(KJ951-A1-501-01)
文摘The electrochemical properties of MEH-PPV were: studied in ionic liquid([bmim](+)[PF6](-)) by cyclic voltammetry, chronoamperometry and AC impedance measurements. Both p- and n-doping of MEH-PPV were observed in the cyclic voltammograms, The chronoamperometric and AC impedance results indicate that the p-doping of MEH-PPV was controlled by the linear diffusion of counterions.
文摘I.r.bands at 1559.0, 1441 .0, 1378 .9, 13603, 1031. 1,981 .4 and 947.3 cm -1 due tovarious types of dissociative adsorption of H2 over ZrO2 with changing temperatore wereobserved by in situ FT-IR spectroscopy.
文摘The effects of 2.8% Cd on the electrochromic properties of NiOxHy film were studied. The film was electrodeposited on both the polished Ni plate and conductive ITO glass to study its electrochemical and optical characteristics respectively. It was found that Cd could decrease the working voltage and increase the oxygen evolution voltage as well as the transmittance difference of colored and breached states of the film. However, it has little effect on the kinetic process.
文摘It is reported that two kinds of specific mass spectrometric fragmentations are generated from dissociations of the intermediates of both the ion-neutral complex and the proton-bound complex. Collision-induced dissociation, isotopic labelling, and semi-empirical AM1 calculations were used to investigate the formation mechanism of the ion of m/z 139 from ionized tetrahydroimidazole-substituted methylene beta-diketones and the unimolecular fragmentations pathway of 3-phenyl-1-butyn-3-ol upon electron impact.
基金the Post-Doctoral Science Foundationthe Natural Science Foundation of Heilongjiang Province
文摘In this paper, the interaction between two collinear cracks inpiezoelectric materials under anti-plane shear loading wasinvestigated for the impermeable crack face conditions. By using theFourier transform, the problem can be solved with two pairs of tripleintegral equations. These equations are solved using Schmidt'smethod. This process is quite different from that adopted previously.This makes it possible to understand the two collinear cracksinteraction in piezoelectric materials.
